ive been told i should get attributed no know error for 75 although it shares 1976 bi bientennial reverse n obverse
Here's what you have . AKA: Off at the Knees Peg Leg https://www.ikegroup.info/DIVA listings/1976 D T1/6D1-201.pdf
I guess I'm missing some information as I did click on Rick's link but still didn't get any information on how it relates to the OPs coin. The photos appear to be just DDD, mechanical doubling to me, but then what do I know.